Evolution of shallow and deep-water deposits included in the regressive drift succession of the Potiguar Basin (Brazilian Equatorial Margin) during the Late Cretaceous to Holocene
The regressive drift succession (late Campanian–Holocene) corresponds to the last major sedimentary cycle of the Potiguar Basin and includes shallow and deep-water deposits that have potential plays similar to other hydrocarbon discoveries in the Brazilian Equatorial Margin and the African conjugate...
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| Published in: | Journal of South American earth sciences Vol. 110; p. 103420 |
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| Main Authors: | , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Elsevier Ltd
01-10-2021
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| Subjects: | |
| Online Access: | Get full text |
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| Summary: | The regressive drift succession (late Campanian–Holocene) corresponds to the last major sedimentary cycle of the Potiguar Basin and includes shallow and deep-water deposits that have potential plays similar to other hydrocarbon discoveries in the Brazilian Equatorial Margin and the African conjugate margin. This study aimed to perform a stratigraphic analysis of regressive drift succession, seeking a better understanding of its evolution and characterization of potential hydrocarbon reservoirs. Based on the interpretations of five exploratory wells and seven seismic lines, this study identified five depositional sequences. In the most proximal regions, sequences 1 and 2 exhibit a dominance of slope facies and sigmoidal/tangential-oblique seismic patterns. In contrast, sequences 3, 4, and 5 show complex sigmoid-oblique seismic patterns. In addition, these last depositional sequences display significant sedimentation of the shelf facies. Sequence 3 marks a remarkable carbonate development in the shelf, whereas a notable siliciclastic input characterizes Sequence 4. Sequence 5, in turn, has its configuration defined by extensive migration of distal deposits toward the proximal portions. Finally, in the distal regions, the five depositional sequences exhibit a preponderance of hemipelagic deposits, with the presence of gravitational flow deposits that occur mainly in the two oldest sequences (1 and 2).
•Recognition of five depositional sequences in regressive drift section of the Potiguar Basin.•Definition of seven seismic facies in the studied interval.•Comprehension of the evolutionary history of shallow and deep-water systems.•Indication of potential oil plays associated with turbiditic deposits.•Understanding the evolution of a mixed siliciclastic-carbonate shelf. |
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| ISSN: | 0895-9811 1873-0647 |
| DOI: | 10.1016/j.jsames.2021.103420 |